FEBCO 0683013 1.5" N Pattern Lead Free Bronze Reduced Pressure Zone Backflow Preventer Assembly with Quarter Turn Ball Shutoff Valve and Angle Union Connections. This 1 1/2 inch lead free N shaped reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of high hazard (toxic) fluids found in the water from entering into the potable water supply due to back siphonage and or backpressure in accordance with national plumbing codes and water authority requirements. It is used in water services to industrial plants, hospitals, morgues, mortuaries, and chemical plants and is also used in irrigation systems, boiler feed, water lines and other installations requiring maximum protection. This compact integral assembly with an extremely short lay length provides versatility and simplifies new and retrofit installations which are advantageous in areas of limited space. This assembly consists of a lead free body, angle union connections, threaded quarter turn ball valves, test cocks, spring loaded Y pattern check valves, and one hydraulically dependent differential relief valve.